SIMOVERT MV Medium-Voltage Drives 660 kVA to 9100 ... - Industry

Motors 6.0 kV and 6.6 kVSIMOVERT MV drive convertersfor output voltages 6.0 kVand 6.6 kV have an IHV-Filter(Integrated High Voltage).These motors can be connecteddirectly to the line supply. Noshaft grounding device and noinsulated coupling are required.Please take account of the following notes:¦ Using 6.0/6.6 kV drive convertersis allowed only fordrives with square-loadtorque (and starting torquereduced accordingly), i.e. notfor constant-torque drives.SIMOVERT MVEngineering informationSingle-motor drives¦ The permissible speed rangeis 1:10 max., the maximumoutput frequency is 66 Hz.¦ The permissible rated motorfrequencies lie in the range30 - 60 Hz.¦ also refer to Page 6/19,sine-wave EMC output filter.2-pole motorsFast converter-fed drives with2-pole motors require specialmeasures regarding theirmechanical design (limiting andcritical speed, bearings, rotordesign, adaptation to the foundation).An inquiry must be sent to themanufacturer for applicationssuch as these.For Retrofit applications, themotors must not showmechanical self-resonant frequency.If required, affected speedranges can be faded by thedrive converter.Explosion proof motorsThe motors are suitable for usein hazardous areas. Regardingthe types of protection, thedesign corresponds to thefixed-speed motors.In addition, the shaft groundingdevice has the type of protectionEEx d IIC T6 (without rotarypulse encoder) / EEx de IIC T6(with rotary pulse encoder).Available types of protection forthe motors:Pressurized enclosureEEx pe IIC T3 acc. toDIN EN 50 016Non sparking EEx n AIIC T3acc. to DIN EN 50 021Please always inquire formotors with increased safetyEEx e.Drives with square-law load torqueDrives with square-law load or load surges do not occur.torque (M ~ n 2 ) such as pumps Thus, the drive converter doesand fans require the full torque not have to be dimensioned forat rated speed. Generally, increasedstartingan overload condition.torquesThe following applies when selectinga suitable drive converterfor square-law load torques:The rated drive converter currentmust be at least as high asthe motor current which flowsat full torque at the requiredload operating point.Constant-load torque drivesSelf-ventilated motors cannotprovide their full rated torque incontinuous operation over thecomplete speed range. Thecontinually permissible torquedecreases with decreasingspeed due to the reducedcooling effect (refer todiagram 4/6).With self-ventilated motors, thetorque and output must be reducedaccording to the specificspeed control range.For force-ventilated motors,depending on the speed controlrange, no or only a comparativelyminor derating in torque,and hence in output, is necessary.In the selection and orderingdata for constant-load torquedrives in section 4, the requiredtorque reduction, as a functionof the speed control range, isalready taken into account forevery motor.For frequencies above the ratedfrequency f N , the motors areoperated in the field-weakeningrange. In this case, the utilizabletorque decreases with approximatelyf N /f, the output remainsconstant. Thus, a margin of˜ 30% to the stall torque mustbe observed, which decreasesaccording to the function(f N /f) 2 .The motor and drive converterassignment for constant-loadtorque drives (M =constant) isbest made so that starting fromthe permissible torque, for continuousduty (S1), a 50% overloadis possible for 60 s. Thismeans that there is generallysufficient reserve for breakawayand accelerating torques.Thus, the base load current ofthe drive converter should beselected to be at least as highas the motor current at the fulltorque and at the required loadpoint.6Siemens DA 63 · 2004 6/13